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TROPICAL STORM ISAAC DISCUSSION NUMBER  40
NATIONAL WEATHER SERVICE MIAMI FL
5 AM EDT SUN OCT 01 2000
 
ISAAC IS NOW TROPICAL STORM AND IS RAPIDLY UNDERGOING EXTRATROPICAL
TRANSITION.  VERY LITTLE DEEP CONVECTION REMAINS NEAR THE CENTER
AND MID-LEVEL DRY AIR CONTINUES TO WRAP INTO THE SYSTEM FROM THE
SOUTHWEST AND SOUTH.
 
INITIAL MOTION IS 060/26.  ISAAC REMAINS CAUGHT UP IN THE STRONG
WESTERLIES...AND CONTINUED ACCELERATION TO THE EAST-NORTHEAST IS
FORECAST THROUGH THE NEXT 36 HOURS.  THIS IS CONSISTENT WITH THE
PREVIOUS FORECAST TRACK AND MOST OF OUR MODEL GUIDANCE.
 
EXTRATROPICAL TRANSITION SHOULD CONTINUE...BUT ONLY SLOW WEAKENING
IS FORECAST DUE TO THE LARGE WIND FIELD ASSOCIATED WITH ISAAC THAT
WILL TAKE SOME TIME TO SPIN DOWN.

THE 34-KT AND 50-KT WIND RADII WERE INCREASED BASED ON A 30/2110Z
QUIKSCAT OVERPASS.
 
FORECASTER STEWART
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL     01/0900Z 41.6N  43.8W    60 KTS
12HR VT     01/1800Z 43.5N  39.5W    55 KTS...EXTRATROPICAL
24HR VT     02/0600Z 46.2N  32.5W    50 KTS...EXTRATROPICAL
36HR VT     02/1800Z 49.5N  23.5W    50 KTS...EXTRATROPICAL
 
 
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